Consequently, by force of the past selective adaptation of men's habits of thought, it happens that the requirements of beauty, simply, are for the most part best satisfied by inexpensive contrivances and structures which in a straightforward manner suggest both the office which they are to perform and the method of serving their end.

It may be in place to recall the modern psychological position.

Beauty of form seems to be a question of facility of apperception.

The proposition could perhaps safely be made broader than this.

If abstraction is made from association, suggestion, and "expression," classed as elements of beauty, then beauty in any perceived object means that the mid readily unfolds its apperceptive activity in the directions which the object in question affords.